I would definitely recommend this to anybody that's a fan of films like the ring or uncomfortable situations where the tension racks up.
The film which unfortunately yes is only one hour, when you get past the actual premise that every time there's a call something dark happens. The film has parts which actually made me Uncomfortable, The tension and the script were good. The actual moments when things are happening are probably better than most jump scare films I've seen. I do wish the film was an extra 30 minutes, but I did look up the director and he's known for doing shorts or small films.
Once about 10 minutes in and you realise what is going on and the storyline/narrative it is a very good film.
